DSA|OC :: Down Syndrome Association Of Orange County

What Do The Screenings & Diagnostics Mean?

Prenatal Testing and Diagnosis
There are two types of tests for Down syndrome that can be performed before your baby is born: screening tests and diagnostic tests. Prenatal screenings estimate the chance of the fetus having Down syndrome. These tests do not tell you for sure whether your fetus has Down syndrome; they only provide a probability. Diagnostic tests, on the other hand, can provide a definitive diagnosis with almost 100 percent accuracy.

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